The Swiss government is planning on introducing two pieces of legislation, both aimed at decreasing noise in the country. First up is a ban on motorcycles that emit 95 decibels. The second part is allowing more use of noise radar, to identify and fine noisy bikes.
Apparently last weekend about 200 motorcyclists held a rally in Bern to protest the planned legislation. You can more about it here, and also link to some other articles about noise radar and noisy motorcycles. And there was another protest the following week.
It sure would be great if they can solve this problem, and provide a model for dealing with noisy motorcycles.